A publicly exploitable privilege escalation flaw, CVE-2026-46300 (Fragnesia), allows any unprivileged user on a Linux system to gain full root access through a deterministic, race-condition-free exploit. This is the third such vulnerability discovered in the same kernel subsystem within two weeks, signaling a systemic weakness rather than an isolated defect. All major Linux distributions are affected, and a public proof-of-concept is available, meaning exploitation requires minimal skill.